MAX5456(2012) データシートの表示（PDF） - Maxim Integrated
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MAX5456 Datasheet PDF : 18 Pages
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MAX5456/MAX5457
Stereo Audio Taper Potentiometers
with Pushbutton Interface
Click/Pop Suppression
The click/pop suppression feature reduces the audible
noise (clicks and pops) that result from wiper transitions.
The MAX5456/MAX5457 minimize this noise by allowing
the wiper position changes only when VH_ = VL_. Thus,
the wiper changes position only when the voltage at L_ is
the same as the voltage at the corresponding H_. Each
wiper has its own suppression and timeout circuitry (see
Figure 5a). The MAX5456/MAX5457 change wiper posi-
tion after 32ms or when VH_ = VL, whichever occurs first
(see Figure 5b).
The suppression circuitry monitors left and right chan-
nels separately. In volume-control mode, when the first
wiper changes position, the second wiper has 32ms to
change or it will be forced to change.
Power-On Reset
The power-on comparators monitor VDD - VSS and
VLOGIC - GND. A power-on reset is initiated when either
of the supplies is brought back to normal operating
voltage. The power-on-reset feature sets both wipers to
-12dB. Power-on reset places the MAX5457 in volume-
control mode.
USER PRESSES PUSHBUTTON
1
DN OR UP
SWITCH SWITCH
CONTACT CONTACT
IS BOUNCING IS STABLE
SWITCH
CONTACT
IS BOUNCING
READY TO ACCEPT
ANOTHER KEYPRESS
INPUT ACCEPTED
0
tHPW
tIPW
tWS
WAIT FOR
DEBOUNCE BY FIRST ZERO
WAITING FOR CROSSING, tWS
STABLE LOW, tIPW
DEBOUNCE BY
WAITING FOR
STABLE HIGH, tHPW
VH
VL
WIPER MOTION
Figure 5a. Wiper Transition Timing Diagram
10
WIPER MOVES HERE
2dB
STEPS
Maxim Integrated
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